EP3380264B1 - Cemented carbide corner radius end mill with continuously curved rake ridge and helical flute design - Google Patents

Cemented carbide corner radius end mill with continuously curved rake ridge and helical flute design Download PDF

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Publication number
EP3380264B1
EP3380264B1 EP16802156.6A EP16802156A EP3380264B1 EP 3380264 B1 EP3380264 B1 EP 3380264B1 EP 16802156 A EP16802156 A EP 16802156A EP 3380264 B1 EP3380264 B1 EP 3380264B1
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EP
European Patent Office
Prior art keywords
radial
rake
cutting
sub
axial
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EP16802156.6A
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German (de)
English (en)
French (fr)
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EP3380264A1 (en
Inventor
Leonid Shpigelman
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Iscar Ltd
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Iscar Ltd
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Application filed by Iscar Ltd filed Critical Iscar Ltd
Priority to PL16802156T priority Critical patent/PL3380264T3/pl
Publication of EP3380264A1 publication Critical patent/EP3380264A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/04—Angles
    • B23C2210/0407—Cutting angles
    • B23C2210/0414—Cutting angles different
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/04—Angles
    • B23C2210/0407—Cutting angles
    • B23C2210/0421—Cutting angles negative
    • B23C2210/0435—Cutting angles negative radial rake angle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/04—Angles
    • B23C2210/0407—Cutting angles
    • B23C2210/0442—Cutting angles positive
    • B23C2210/0457—Cutting angles positive radial rake angle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/08—Side or top views of the cutting edge
    • B23C2210/082—Details of the corner region between axial and radial cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/20—Number of cutting edges
    • B23C2210/206—Number of cutting edges seven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/40—Flutes, i.e. chip conveying grooves
    • B23C2210/402—Flutes, i.e. chip conveying grooves of variable depth
    • B23C2210/405—Flutes, i.e. chip conveying grooves of variable depth having decreasing depth in the direction of the shank from the tip of the tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
    • B23C2222/28—Details of hard metal, i.e. cemented carbide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
    • B23C2222/64—Nickel

Definitions

  • the subject matter of the present application relates to an integral tooth corner radius end mill as per the preamble of claim 1, having a rake ridge at an intersection of rake recessed and rake cutting sub-surfaces, and a helical flutes design, especially for particularly difficult to machine materials such as inconel.
  • An exemplary cemented carbide corner radius end mill is known from US 6846135 B2 .
  • End mills types can be considered to fall within three main end mill categories, namely ball, square and corner radius.
  • the subject matter of the present application relates only to the latter category, corner radius end mills.
  • a corner of a corner radius end mill comprises a circular arc profile.
  • the circular arc profile is present during rotation of such end mills about a rotation axis when the end mill is viewed in a direction perpendicular to the rotation axis. For the purposes of the specification and claims, this will be called a "profile view”.
  • the circular arc profile defines a portion of an imaginary circle.
  • the circle defines reference locations including: a circle center point, axial and radial tangent lines, axial and radial tangent points, and a bisector line.
  • the axial tangent line extends forwardly from the circle center point and in a direction parallel with a rotation axis of the end mill.
  • the radial tangent line extends radially outward from the circle center point and in a direction perpendicular with the rotation axis.
  • the bisector line extends outward from the circle center point and intersects the circle at a bisector point equally circumferentially spaced from the axial and radial tangent points.
  • a first angle subtended by the bisector line to the axial tangent line and a second angle subtended by the bisector line to the radial tangent line are equal.
  • reference parameters such as the circle and associated lines, planes and tangent points, mentioned above are imaginary and hence are not visible features on an end mill but rather are derivable through the construction thereof as explained above.
  • a corner radius end mill having a tooth, the tooth comprising a rake ridge which is continuously curved from a bisector line until at least an axial location rearward of a corner relief surface of the tooth.
  • Known end mills of the type under consideration comprise a discontinuity along the rake ridge at an axial location coinciding with the corner relief surface.
  • the present application provides a geometry in which the discontinuity is removed or rendered insignificant thereby allowing improved workpiece finish and tool longevity under the difficult conditions of machining materials such as inconel.
  • a corner radius end mill having a rotation axis defining forward and rearward directions, and comprising: front and rear ends and a peripheral surface extending therebetween; a cutting portion extending rearwardly from the front end; and a shank portion located rearward of the cutting portion; the cutting portion having a cutting portion diameter at the front end and an effective cutting length, and comprising: integrally formed teeth extending from the front end to the peripheral surface; and a helical flute located between each pair of adjacent teeth and having a helix angle H fulfilling the condition: 25° ⁇ H ⁇ 60°; an index angle S is subtended between each pair of adjacent teeth; each tooth comprising: a relief surface; a rake surface; a cutting edge formed at an intersection of the relief and rake surfaces; and a corner comprising a circular arc profile defining a circle having a circle center point, a circle radius, axial and radial tangent lines, and a bisector line; the relief surface comprising: an
  • Figs. 1A and 1B illustrate a corner radius end mill 10, made of cemented carbide, and particularly configured for machining difficult to machine materials such as inconel.
  • the end mill 10 is configured to rotate about a rotation axis 12, which can extend longitudinally through the center thereof and coincide with an end mill center point C E .
  • an end mill rotation direction D A is counter-clockwise in the front end view shown in Fig. 1B .
  • the rotation axis 12 can define opposite forward and rearward directions D F , D R (noting that while these directions are parallel with the rotation axis 12 they need not be coaxial therewith).
  • the end mill 10 comprises opposite front and rear ends 14, 16 and a peripheral surface 18 extending between the front and rear ends 14, 16.
  • the end mill 10 comprises a cutting portion 20 and a shank portion 22 located rearward of the cutting portion 20.
  • the cutting portion 20 comprises a cutting portion diameter D E , measurable at the front end 14 and an effective cutting length L E .
  • the effective cutting length L E extends from the front end 16 to an axial location where tooth relief surfaces are no longer effective, which is visible in this example at the axial location designated with the reference character "23". Also exemplified is the front half of the effective cutting length, designated L H , which extends from the front end 14 to an axial location L M at the middle of the effective length L E .
  • the cutting portion 20 comprises integrally formed teeth 24 (e.g., first, second, third, fourth, fifth, sixth and seventh teeth 24A, 24B, 24C, 24D, 24E, 24F, 24G).
  • integrally formed teeth 24 e.g., first, second, third, fourth, fifth, sixth and seventh teeth 24A, 24B, 24C, 24D, 24E, 24F, 24G.
  • index angle S (e.g., first, second, third, fourth, fifth, sixth and seventh index angles S A , S B , S C , S D , S E , S F , S G ) is subtended between each pair of adjacent teeth.
  • the cutting portion 20 comprises a helical flute 26 (e.g., first, second, third, fourth, fifth, sixth and seventh flutes 26A, 26B, 26C, 26D, 26E, 26F, 26G), i.e. at least extending helically adjacent to the front end 14, circumferentially located between each pair of adjacent teeth 24.
  • a helical flute 26 e.g., first, second, third, fourth, fifth, sixth and seventh flutes 26A, 26B, 26C, 26D, 26E, 26F, 26G
  • Each flute 26 can have a helix angle H formed with the rotation axis 12.
  • the end mill 10 can comprise a tapered core schematically shown by a tapering angle ⁇ .
  • Each tooth 24 can comprise the following generally designated portions: a relief surface 28, a rake surface 30, a cutting edge 32 formed at an intersection of the relief surface 28 and the rake surface 30, and a corner 34. It is noted that the relief surface 28 identified in Fig. 3A is the relief surface of a tooth 24 different to the tooth shown with the numerical designations of the other elements, this being only because the relief surface of the uppermost tooth in Fig 3A is not visible in the profile view shown.
  • the corner 34 presents a circular arc profile defining a portion 36 of an imaginary circle I C .
  • the circle I C has: a circle center point C C ; axial and radial tangent lines L A , L R ; axial and radial tangent points P AP , P RP located at intersections of the axial and radial tangent lines L A , L R and the cutting edge 32; a bisector line L B equally angularly spaced between the axial and radial tangent lines L A , L R .
  • the relief surface 28 comprises different portions, namely an axial relief surface 28A ( Fig. 1B ) at the front end 14, a radial relief surface 28B ( Fig. 3A ) at the peripheral surface 18, and a corner relief surface 28C ( Fig. 3C ) connecting the axial and radial relief surfaces 28A, 28B.
  • Fig. 3B shows the rake surface 30 comprising different portions, namely a rake cutting sub-surface 30A extending adjacent the cutting edge 32, a rake recessed sub-surface 30B, and a rake ridge 30C formed at an intersection of the rake cutting and rake recessed sub-surfaces 30A, 30B.
  • the cutting edge 32 comprises different portions, namely an axial sub-edge 32A at the front end 14 extending to the axial tangent line L A , a corner sub-edge 32B extending from the axial tangent line L A to the radial tangent line L R , and a radial sub-edge 32C extending rearward from the radial tangent line L R .
  • an axial rake angle ⁇ is subtended between a gash surface line 33 to the rotation axis 12.
  • the example axial rake angle ⁇ shown is a positive angle.
  • a corner rake angle ⁇ is subtended between the corner sub-edge 32B and the rotation axis 12.
  • each rake ridge 30C has a ridge shape, i.e., in the view shown, an apex descending to the rake cutting and rake recessed sub-surfaces 30A, 30B.
  • This shape occurs regardless of whether the rake ridge 30C is located below a radial line 42 extending from the rotation axis 12 to the radial sub-edge 32C such as that shown in Fig. 5A (and hence exemplifying a positive radial rake angle, i.e. ⁇ A > 0°), or above the radial line 42 as exemplified in Fig. 5B (showing a negative radial rake angle, i.e. ⁇ B ⁇ 0°).
  • Each rake cutting sub-surface 30A has an actual internal cutting angle ⁇ having a greater value than an imaginary internal cutting angle ⁇ associated with the rake recessed sub-surface 30B. More precisely, referring to Fig. 5B as an example, an imaginary rake extension line 38, extending the rake recessed sub-surface 30B from the rake ridge 30C intersects an imaginary relief extension line 40 which extends the radial relief surface 28B.
  • the rake cutting sub-surfaces 30A can have a planar shape (as is understood from the straight line visible in the side views in Figs. 5A and 5B ).
  • the rake recessed sub-surfaces 30B of each tooth can have the same shape, which can be a concave shape as shown in Figs. 5A and 5B .
  • the shape is recessed from the associated rake cutting sub-surface 30A so that chips which have been machined from a workpiece (not shown) can preferably pass over the rake recessed sub-surface 30B without contact, especially at points immediately adjacent the rake ridge 30C, thereby reducing heat transfer to the end mill.
  • cutting sub-surface widths W are measurable between closest points of the rake ridge 30C and the cutting edge 32.
  • a radial cutting sub-surface width W R is measurable along the radial tangent line L R
  • a bisector cutting sub-surface width W B is measurable along the bisector line L B2
  • an axial cutting sub-surface width W A is measurable along the axial tangent line L A .
  • the rake cutting sub-surface 30A can comprise three distinct sub-portions. Namely, a radial sub-portion 30A1, an axial sub-portion 30A2, and a corner sub-portion 30A3. First and second curvature lines 44A, 44B may be visible to show limits of the sub-portions.
  • a perpendicular plane S P extending perpendicular to the rotation axis 12, can be defined at the rearmost point 45 of the corner relief surface 28C.
  • the perpendicular plane S P defines an axial location along the rotation axis 12.
  • the end mill 10 can then be rotated around the rotation axis 12 until the profile view shown in Fig. 3B is visible.
  • the perpendicular plane S P is also derivable in Fig. 3B even though the corner relief surface 28C is not visible, since the axial location has been noted. It will be understood that the precise axial location of the perpendicular plane S P in Fig. 3B has been added schematically for explanatory purposes only.
  • Fig. 3B shows that the rake ridge 30C is continuously curved from the bisector line L B until at least an axial location, shown by perpendicular plane S P , rearward of the corner relief surface 28C. Indeed the rake ridge 30C is continuously curved in the entire view shown in Fig. 3B .
  • “continuously curved” means that the rake ridge 30C does not contain a discontinuity.
  • a prior art end mill 10' is shown in Figs. 2A to 2C with basically corresponding elements having the same reference characters suffixed with an apostrophe (').
  • the corner 34' has two sub-portions, namely a radial sub-portion 30A1' and a single corner-axial sub-portion 30A4' which is shown to meet the radial sub-portion 30A1' at a single curvature line 44C'.
  • a corner-axial rake ridge portion 30C1' extending along the single corner-axial sub-portion 30A4' does not continuously curve to the connected radial rake ridge portion 30C2' as shown by the discontinuity 46'.
  • a perpendicular plane Sp' which locates the axial location of the rearmost point 45' of the corner relief surface 28C' ( Fig. 2C ), is located rearward of the discontinuity 46'.
  • an external relief angle ⁇ ( Fig. 3C ), measured between the corner and radial sub-edges 32B, 32C can be advantageously closer to 180° than the comparatively smaller external relief angle ⁇ ' ( Fig. 2C ) of the prior art tool 10'.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
  • Crushing And Grinding (AREA)
  • Tires In General (AREA)
EP16802156.6A 2015-11-23 2016-10-26 Cemented carbide corner radius end mill with continuously curved rake ridge and helical flute design Active EP3380264B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL16802156T PL3380264T3 (pl) 2015-11-23 2016-10-26 Frez z węglika spiekanego do promieni naroża z ciągłą zakrzywioną krawędzią pochylenia i spiralnym rowkiem

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14/948,712 US10131003B2 (en) 2015-11-23 2015-11-23 Cemented carbide corner radius end mill with continuously curved rake ridge and helical flute design
PCT/IL2016/051152 WO2017090021A1 (en) 2015-11-23 2016-10-26 Cemented carbide corner radius end mill with continuously curved rake ridge and helical flute design

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Publication Number Publication Date
EP3380264A1 EP3380264A1 (en) 2018-10-03
EP3380264B1 true EP3380264B1 (en) 2020-02-26

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US (1) US10131003B2 (ru)
EP (1) EP3380264B1 (ru)
JP (1) JP6868023B2 (ru)
KR (1) KR102532903B1 (ru)
CN (1) CN108290232B (ru)
BR (1) BR112018010285B1 (ru)
CA (1) CA3005711C (ru)
ES (1) ES2775183T3 (ru)
IL (1) IL258780B (ru)
PL (1) PL3380264T3 (ru)
PT (1) PT3380264T (ru)
RU (1) RU2714755C2 (ru)
TW (1) TWI707736B (ru)
WO (1) WO2017090021A1 (ru)

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TR201515785A2 (tr) * 2015-12-09 2017-02-21 Alp Havacilik Sanayi Ve Ticaret Anonim Sirketi 28° ile 43° ARALIĞINDA HELİS AÇISINA SAHİP YEKPARE SERAMİK PARMAK FREZE KESİCİ TAKIMI
US9884379B1 (en) * 2017-03-07 2018-02-06 Iscar, Ltd. Ceramic face mill with circular arc profile for machining Inconel
US10486246B2 (en) 2018-02-26 2019-11-26 Iscar, Ltd. End mill having a peripheral cutting edge with a variable angle configuration
WO2019188135A1 (ja) * 2018-03-27 2019-10-03 日本特殊陶業株式会社 エンドミル本体及びエンドミル
JP7075584B2 (ja) * 2018-04-16 2022-05-26 三菱重工業株式会社 ラジアスエンドミル及びこれを用いた工作機械、並びにラジアスエンドミルの設計方法及び加工方法
IL264757B (en) * 2019-02-10 2022-07-01 Hanita Metal Works Ltd Milling with independent diagonal surfaces
CN109773253A (zh) * 2019-03-15 2019-05-21 广东长盈精密技术有限公司 端铣刀
CN113843443A (zh) * 2021-10-12 2021-12-28 东莞富兰地工具股份有限公司 圆鼻铣刀

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KR102532903B1 (ko) 2023-05-17
JP2018534164A (ja) 2018-11-22
KR20180085724A (ko) 2018-07-27
RU2714755C2 (ru) 2020-02-19
JP6868023B2 (ja) 2021-05-12
CN108290232A (zh) 2018-07-17
TWI707736B (zh) 2020-10-21
PL3380264T3 (pl) 2020-07-13
CN108290232B (zh) 2020-04-28
IL258780B (en) 2022-01-01
EP3380264A1 (en) 2018-10-03
RU2018122620A3 (ru) 2020-01-24
CA3005711A1 (en) 2017-06-01
WO2017090021A1 (en) 2017-06-01
CA3005711C (en) 2023-05-23
RU2018122620A (ru) 2019-12-26
US20170144234A1 (en) 2017-05-25
BR112018010285A2 (pt) 2018-11-27
BR112018010285B1 (pt) 2021-12-28
TW201720553A (zh) 2017-06-16
ES2775183T3 (es) 2020-07-24
US10131003B2 (en) 2018-11-20
IL258780A (en) 2018-06-28
PT3380264T (pt) 2020-05-06

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